## Hands-On-Physics## GLOSSARY |

### Variables

- Variables are names for quantites. These names appear in mathematical expressions
as letters. For example; in the expression y = 7x, both y and x are variables.
Once the variable x is assigned a quantity the value of y is fixed. In this example,
when x is set to 2, y becomes fixed at 14.

__Dependent Variable:__

When two variables are related, we say that one depends on the other. This variable is called the**dependent variable**. The"other" variable is free to roam so it is called the independent variable. In a scientific experiment, the experimenter chooses values for the independent variable, runs the experiment, and**measures**the dependent variable. Ordered pairs of choosen and measured values (independent and dependent) are often plotted on a two dimensional graph for visualization. The dependent variable is traditionally plotted on the vertical axis.

__Independent variable:__

- When two variables are related, one of the variable is free to roam
so it is called the
**independent variable**. The other variable depends on the first, so it gets the name*dependent*. In a scientific experiment, the experimenter**chooses**values for the independent variable, runs the experiment, and then measures the dependent variable. Ordered pairs of choosen and measured values (independent and dependent) are often plotted on a two dimensional graph for visualization. The independent variable is traditionally plotted on the horizontal axis.

- The "length" of the velocity vector is the speed. The direction of the motion (ø), is also part of the velocity vector.
- Voltage is an energy measure, the energy carried by one coulomb of electrical charge. The voltage between two points in a circuit is the amount of energy available for pushing each coulomb of charge from one of these points to the other.

- Work is done on an object whenever it moves because it is pushed or pulled. Work increases the energy of the object.

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